16 and below is unambiguous. It’s a child up to and including 16 years old. Compare that to “below 17” for example, which technically means the same but might be confused to include 17 by someone skimming the question.
Below 17 means exactly that, 0-16. 16 and below, while understood to mean 16 or below in this context, actually means the child would have to be both 16 and also between the age of 0-15.
16 and below is unambiguous. It’s a child up to and including 16 years old. Compare that to “below 17” for example, which technically means the same but might be confused to include 17 by someone skimming the question.
Should be 16 or below since you can’t be more than one year of age at the same time.
Below 17 means exactly that, 0-16. 16 and below, while understood to mean 16 or below in this context, actually means the child would have to be both 16 and also between the age of 0-15.